塔里木盆地顺南地区中-下奥陶统正演沉积数值模拟

利用正演沉积数值模拟，恢复了塔里木盆地顺南地区中-下奥陶统沉积演化过程。综合分析基础地质条件，以Dionisos软件为平台，建立了塔里木顺南地区中-下奥陶统正演沉积数值模拟的初始模型。通过调整构造沉降、海平面变化、沉积物产率、波浪强度和方向等参数及模型校验，以正演方法再现了该地区三维沉积演化过程，并分析了沉积旋回演化、关键界面特征和内部沉积格局。早中奥陶世，塔里木盆地顺南地区发育四个沉积旋回，四次相对海平面下降形成了中-下奥陶统蓬莱坝组下段、蓬莱坝组上段、鹰山组下段、鹰山组上段等顶面多个局部或区域短期暴露面，形成了非断裂控制的短期暴露岩溶。

A Three-dimensional Numerical Sedimentary Simulation Model for the Lower-Middle Ordovician of Shunnan Area,Tarim Basin

The numerical sedimentary forward simulation of Lower-Middle Ordovician of Shunnan area in Tarim Basin was presented by means of software Dionisos, which are controlled by primary model, tectonic subsidence, fluctuation of sea level, sedimentation rate and wave energy. Through the validation, the appropriate model has been chosen and then the sedimentary process is clear. The evolution of this area has four deposititional cycles. The distribution of carbonate reef, beach and short-time exposed surfaces has been analyzed. During Early-Middle Ordovician, there developed four frequent short-time exposure surfaces which occurred at the top of the depositional cycle in Shunnan area and resulted in the formation of vugular-pore in carbonate deposits subjected to leaching and dissolution of meteoric fresh water,leading to which makes a change that only the fracture dominates the development of the carbonate reservoir.